But the partnership's most ambitious effort is yet to come.

It is the great architect's most ambitious effort in modern city planning.

It's an ambitious effort, but there are two sticky problems.

Emily's List is making an ambitious effort to make a science of politics.

Not since 1997 has Congress made such an ambitious effort to slow the growth of benefit programs.

The city has begun an ambitious effort to produce new housing, but cannot begin to meet the demand.

The units will be part of what state officials call Connecticut's most ambitious effort to step up drug enforcement.

Immigration advocates said it was the most ambitious such effort by a local government anywhere in the country.

It was another child's plaything but my most ambitious effort yet.

But Saddam's ambitious efforts to expand his power had only just begun.